An IP Alias allows a Vigor Router to control multiple LAN IP addresses in a single subnet. Each IP address can be a gateway mapping to a specific WAN interface. So LAN clients can go through a different WAN interface simply by changing their gateway IP on the PC.
This is useful when you have more than one ISP, and some websites/services perform better when accessed via ISP1, while others are better via ISP2. When connection quality depends not only on the ISP but also on which server/websites the LAN client is connecting via, the LAN IP alias allows the LAN client to choose their desired Internet gateway based on user experience.
To set up LAN IP Alias on a Vigor Router:
1. Go to the LAN >> General Setup page, and click Details Page for the LAN profile.
2. Click on the LAN IP Alias button.
3. Configure the LAN IP Alias settings in the pop-up window:
a. Enable an index
b. Give it a un-used IP which is in the same IP range as the LAN profile.
c. Choose an Output Interface.
d. Click OK to save the settings.
4. The Router now has two LAN IP addresses in the LAN subnet, and the LAN clients can easily choose which WAN interfaces they would like to go through by changing the gateway setting on their computers.